Answer to: 'What is the parent block for all Magento blocks?' added, thanks to Tobias Zander tobias.zander@sitewards.com
Link added to 'Create custom product types from scratch or modify existing product types'
Kalpesh's link changed to: http://ka.lpe.sh/
Two answers added: 'Is it possible to have a block without a template in Magento?' and 'What events do Mage_Core_Block_Abstract and Mage_Core_Block_Template fire?' thanks to: Tentura Team info@tentura.eu